Hummer H3. Manual — part 731

4. Forward Flush

5. Flow Check

6. Clean-up

Tools Required

J 35944-A Transmission Oil Cooler Flusher. See Special Tools.

J 35944-22 Transmission Oil Cooler Flushing Fluid. See Special Tools.

J 35944-200 Cooler Flushing Adapter. See Special Tools.

Measuring cup

Funnel

Water supply, hot water recommended

Water hose, at least 16 mm (5/8 in) ID

Shop air supply, with water/oil filters, regulator and pressure gage

Air chuck, with clip if available

Oil drain container

Pail with lid 19 L (5 gallon)

Eye protection

Rubber gloves

Preparation

1. During the installation of the repaired or replacement transmission, do not connect the oil

cooler pipes.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

Fig. 23: Identifying Flusher Tank & Components
Courtesy of GENERAL MOTORS CORP.

NOTE:

Do not use solutions that contain alcohol or glycol. Use of
solutions that contain alcohol or glycol may damage the oil
cooler line flusher, oil cooler components and/or transmission
components.

IMPORTANT: The J 35944-22 is environmentally safe, yet powerful enough

to cut through transmission fluid to dislodge any
contaminants from the cooler. See Special Tools. The safety
precautions on the label, regarding potential skin and eye
irritations associated with prolonged exposure, are typical
precautions that apply to many similar cleaning solutions. It
should be noted that according to GM, use of other non-

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

2. Remove the fill cap (9) on the J 35944-A and fill the flusher tank (4) with 0. See Special

Tools.6 L (20-21 oz.) of J 35944-22 , using the measuring cup (6). See Special Tools. Do
not overfill.

3. Install the fill cap (9) on the J 35944-A and pressurize the flusher tank (4) to 550-700 kPa

(80-100 psi), using the shop air supply at the tank air valve (2). See Special Tools.

4. With the water supply valve (1) on the J 35944-A in the OFF position, connect the water

supply hose from the J 35944-A to the water supply at the faucet. See Special Tools.

5. Turn ON the water supply at the faucet.

Back Flush

1. Inspect the transmission oil cooler pipes for kinks or damage. Repair as necessary.

approved fluids for cooler flushing can have an adverse
reaction to the seals inside the transmission.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

Fig. 24: Connecting J 35944 To Oil Cooler
Courtesy of GENERAL MOTORS CORP.

2. Connect the J 35944-A to the oil cooler feed bottom connector. See Special Tools. Use the

J 35944-200 , if required.

3. Clip the discharge hose (2) onto the oil drain container.

4. Attach the J 35944-A to the undercarriage of the vehicle with the hook provided and

connect the flushing system feed supply hose (1) from the J 35944-A to the top connector
oil cooler return pipe. See Special Tools. Use the J 35944-200 , if required.

5. Turn the J 35944-A water supply valve (3) to the ON position and allow water to flow

through the oil cooler and pipes for 10 seconds to remove any remaining transmission fluid.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3